package Network;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class TcpEchoServer {
   private ServerSocket serverSocket = null;
    public TcpEchoServer(int port) throws IOException {
        serverSocket=new ServerSocket(port);
    }
    public void start() throws IOException {
        //创建一个线程池
        ExecutorService executorService = Executors.newCachedThreadPool();
        System.out.println("服务器启动");
        while (true){
            //处理连接

            Socket clientSocket = serverSocket.accept();
            executorService.submit(()-> {
                try {
                    processConnection(clientSocket);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });

        }
    }

    private void processConnection(Socket clientSocket) throws IOException {
        System.out.printf("[%s,%s]:客户端上线",clientSocket.getInetAddress(),clientSocket.getPort());
        try(InputStream inputStream = clientSocket.getInputStream();
            OutputStream outputStream = clientSocket.getOutputStream()){
            Scanner scanner = new Scanner(inputStream);
            PrintWriter printWriter = new PrintWriter(outputStream);
            while (true){
                if(!scanner.hasNext()){
                    System.out.printf("[%s:%d] 客户端下线!\n", clientSocket.getInetAddress(), clientSocket.getPort());
                    break;
                }
                String request = scanner.next();
                String response = process(request);
                printWriter.println(response);
                printWriter.flush();
                System.out.printf("[%s,%s],rep:%s,resp:%s",clientSocket.getInetAddress(),clientSocket.getPort(),request,response);
            }
        }finally {
            clientSocket.close();
        }

    }

    private String process(String request) {
        return request;
    }
    public static void main(String[] args) throws IOException {
        TcpEchoServer tcpEchoServer = new TcpEchoServer(9090);
        tcpEchoServer.start();
    }

}

